Abstract: The laminated composite of Fe–Al alloy and CrMo steel was fabricated by clad rolling to
provide additional properties to the steel such as corrosion resistance, strength, and light weight.
Three layered composite consisting of alloy/steel/alloy was succesfully fabricated using the process
condition to satisfy the criteria for simultaneous deformation of different materials. The fabricated
composite could be cold rolled to 120 μm thickness (99.8 % reduction), and wound to a coil without
damage. The corrosion resistance of the composite in a sulfuric acid solution was comparable to
that of monolithic CrMo steel, and it depends on the aluminium content of the Fe–Al alloy. The
aluminium content dependence of the corrosion behavior is explained by the corrosion potential
(Ecorr) of the Fe–Al alloy derived from the polarization curves in the solution. In order to improve
the corrosion resistance of the composite, pre-oxidation treatment was conducted to form Al2O3
layer to protect the substrate. Analyses by XPS and SIMS show that the Al2O3 oxide fraction
increases with the oxidization temperature and Al content of the alloy. The pre-oxidation treatment
improved the corrosion resistance of the composite in a sulfuric acid solution. It is concluded that
the effect of oxidation on the corrosion resistance is due to the formation of Al2O3 oxide and the
Al2O3 fraction in the oxides.

Abstract: Semi solid processing reduces porosity and amount of trapped gas and it allows heat
treatment T6 that improves a hard anodized oxide layer. The aim of this work is to show the
anodizing possibility of A356 T6 components conformed by Sub-liquidus Casting (SLC) to improve
wear and corrosion resistance. This work compares the anodizing effect on tribological properties
and corrosion resistance between components obtained by A6061 T6 extruded alloys and from
A356 T6 produced by SLC. The effect of rounded silicon crystals on the coating formation and the
fracture produced during the coating growth are described.

Abstract: In order to get a clear picture for describing the growth process of plasma electrolytic oxidation coatings under escalating voltage waveform, the characteristics of PEO coatings formed at different reaction stages were systemically investigated. The morphology and corrosion resistance of the films were studied by scanning electron microscope and potentiodynamic polarization curves. The uniform, semi-transparent and better corrosion resistance of the oxide films on the magnesium electrode surface were formed owe to the extended anodizing time at the initial stage under escalating voltage mode. After sparking occurred, generated ceramic coatings were brokedown, melted, cooled and solidified continuously, so the ceramic coatings were uniform and dense. It also exhibited superior corrosion resistance.

Abstract: Environmentally assisted cracking (EAC) or stress corrosion cracking (SCC) of key structural materials in the environments of the light water reactor is one of the main problems for the management of the structural safety and service life of nuclear power plants. To understand the effect of oxide film thickness on SCC growth in structural materials in a high temperature water environment, the stress-strain field at the tip of a SCC in nickel base alloy constituted by base metal and oxide film was analyzed in this paper by finite element method using commercial software. The effects of oxide film thickness on the stress-strain field at the tip of the SCC was obtained, which provides a new insight into the research of the mechanism of SCC growth in structural materials in a high temperature water environment.

Abstract: Special SHY-99 anti-corrosion coatings are used for newly developed heat exchange equipment, to resist corrosion and leakage problem of carbon steel water-cooler. The anti-corrosion properties of coatings were examined with routine test methods, Scanning Electron Microscope (SEM), electro kinetic potential polarization curve method and immersion testing method. The results show that physical properties of coatings are in accordance with national standards, the microstructures of coatings are uniform and tight, the coatings are combined tightly with base metal, and the coatings show excellent corrosion resistance in water of water cooling system.